Frederick a



F A. SCHROEDER.A

SAFETY PRESSURE GAGE. APPLxcAHQN F|LED`APR.23.1915.

lPatented A11-g. 29, 1916.

.which the gage is so set that when the pres- FREDERICK A. SCHROEDEE, OE CHICAGO, ILLINOIS, AssIeNoH 'ro THE HILLIUMP vALvE^CO1 \II ANY, OF CHICAGO, ILLINOIS, A CORPORATION OE ILLINOIS..

- SAFETY PRESSURE-GAGE.

To all uihom may concern: *I

Be it known that I, FREDERICK A. SCHROEn DER, a citizen of the United States, residing at Chicago, in the county of Cook and Statey of'lllinois, have invented new and useful Improvements nl Safetyl .Pressure-Gages, of which the following is afull, clear, conoise, and exact description, reference-being had to` the accompanyingl drawing,- forming a part of this` speciication. y

Myv inventlon. relates 'to'safety pressure gages, Vand in its more speci'c aspect to.`

` gages of the type having means tor attachment to the valve stem of a pneumatic/tire cated above, in which, when the pressure reaches a predetermined point, the air will tailed description to follow.

and-to a source ofjcompres'sed air, and'in sure therein reaches a predetermined point air will be permitted to escape to prevent furtheryrise in pressure.

My `invention has for its obj ect to provide animproved'device of the character indi# be permitted to escape and an audible signal willbe made, and which is simple and reliable in its construction and operation.

Further objects -willfappear from the delIn the drawings, In which embodiment of my inv'ention'-Figure 1 1s a central section of my improved device; Fig.

2 is a side elevation of the pressure vrgage;

. and Fig. 3 is a section on the line 3f-3 of Fig. 2.

Referring now to the drawings a tubular member 4 is provided with an enlarged portion 5 upon which'is swiveled a connecting member 6 having a threaded portion 7 for'.

engagement with the threaded -portion of the -valve stem of apneumatic tire. other end of the member 4 vlhas ar screw threaded connection with a tubular member 8 having a threaded portion 8a: and a tapering nipple portion 8b over which is slipped the endof a tube 9. The tube 9 is held in place on the nipple by means of a sleeve 10 having a screw threaded connection` with4 'l tension of the spring28. The shell 25 is the part 8a and a tapering sleeve portion 11 which clamps the end of the tube 9 'against the nipple 8". A hollow cylinder 12`has an eX- tension 13 at one end thereof through which I illustrate one The "Patented Aug'. 29, 1916.

tion with the interor of the tubular member 4 through passages between the sides of the Opening14` and thelsides of the valve mem- .'ber 15 (which arecut away as indicatedat 16) and through the opening 17 in the side of the member 4. A tubular member 18 is )20 21 and threadedr on the 'tubular member yslidably mounted in the cylinder 12 and has l 18, the member 19 forming an airtight Y packing between the tubularfmember 18 and the cylinder 12. At one end of the tubular memberv-18 is an annular valve member 22 with which the valve member 15 Acoperates a to close the opening through the member 22. The tubular member 18 has 'a center opening 23 topermit the escape of air there-- through. 1

.A coiled spring 24 bears againsty the and has a Contracted portion 27 in which is threaded-a sleeve 28 having a tubular bear-l "ing' member 29 threaded therein; The bearwasher 20. A cylindrical shell 25has a screw lthreaded connection 26 with the'cylinder12 tool whereby it may be adjusted in the 4sleeve v28. A signal device 34 is secured to the end of the sleeve 28'in any suitable ymanf ner,vas by `threading it thereimand is cut away as shown at '341L to provide a lip 34b to form a whistle. device is closed by'meansof a plug 35 and a partition 36 is provided within the sounding device having an opening 37 therein through whi Lh the all' 'escaping past the lvalve member- 15 and through the `opening 23 vand, sleeve 28 is directed against thel lip 34b to cause a whistling sound. The sleeve 28 has fixedly secured thereto in a suitable manner a` tubularoperating member. 38

-whereby Athe sleeve may -be screwed in and outwith respectl to the shell 25 to vary the provided with a scale, as indicated at 39, Fig.2, the edge 40 of the operating member 38 acting as an indicator Vfor said scale. 'The purpose .of the adjustable member 33 is to enable the tension of the. spring 28 to be adjusted so thatthe pressure at which .thev'passage between the valve members 15 and 22 The en d of the signal i.

is opened will correspond to the pressure indicated on the scale.

The use and operation of my device is as follows: The gage is connected to the valve stem of a pneumatic tire by means of the threaded connection 7, the tube 9 is connected to a source et' compressed air and the i member 3S is adjusted until the edge l0 indicates the desired pressureon the scale 39. lWhen this pressure is reached, the air acting on the tubular member 18 and annular member 19 will cause them to move against the pressure of the spring 24 causing the valve member 22 to move away from the valve member l5, allowing the air to escape therebetween and to flow through the opening Q3 against the iip 34", through shell 25,V

tubular member 225i, sleeve 28 and opening 2T, causing the `whistle to scund,md1cating that the desired pressure has been reached.`

It is to be noted that in `my improved device one of the, valve members is fixed with respect to the cylinder, so that the piston, has buta short dlstance to move to cause the escape valve to open. j e

Having thus described my invention what l claim as new and desire to secure by Letters Patent is:

l. A tire gage device comprising means :tor attaching said device to a valve stem, means for connecting it to a source ot compressed air, and a passage between said connecting and attaching means, a` cylinder, a plunger recijn'ocating therein having a passa gc therethrough, a conical valve member located in position to enter and close said passage as the plunger moved toward it, and a passage connecting said first passage and the cylinder, said conical valve member having a portion threaded into said last passage, said threads being mutilated to provide a passage for the compressed air to the cylinder.

2. A tire gage device comprising means for attaching said device to a valve stem, means t'or connecting it to a source ot compressed air, and a juissage between said connecting and attaching means, a passage leading from said first passage, and means itor controlling the esi-ape ot air through said last passage comprising a spring, adjustable means acting upon said .spring tor setting it tor various pressures, a scale coperating with said adjustable means for indicating the various pressures and adjustable means carried b v said tiret adjustable means acting on said spring 'l'or securing the proper adjustment ol' said spring with respect to said irst adjusting means so that the air will escape atthe pressure indicated ou said scale.

3. A. tire gage device comprising means tor attaching saidwlevice to a valve stem, means for conm-acting it to a source of compressed air, and a passage between said connecting and attaching means, a passage leading from said first passage, and means for controlling the escape of air through said last passage comprising a spring, adjustable means acting upon said'spring for setting it for various pressures,a scale coperating with said adjustable means for indicating the various pressures, and adjustable means carried. by said rst adjustable means acting `means for connecting it to a source of compressed air, and a passage between said connecting and attaching means, a passage leading from said first passage, and means for controlling the escape of air through said last passage comprising a spring, adjustable means acting upon said spring for setting it for various pressures, a scale eoperating with said adjustable means tor indicating the various pressures, and adjustable means carried by said rst adjustable means acting on said spring for securing the proper adjustment, ot said springI with respect to said first adjusting means so that the air will escape at the pressure indicated on said scale, said first adjustable means comprising a tubular memberl said other adjustable means comprisingl a tubular member threaded in said first tubular member, said tubular members affording a passage for the escape of the air, a 1d an air ojjicrated signal device supplied with air through said tubular members.

5; A tire gage device comprising means :tor attaching said device to a valve stem, means for connecting it to a source of cornpressed air, and a passage between said connecting and attaching means, a passage leading from said first passage` and means for controlling the escape ot' air through said last passage comprising a spring, adjustable means acting upon said spring for setting it forvarious pressures, a scale coperating with said adjustable means for indicating the various pressures, and adjustable means carried bj' said first adjustable means acting on said spring for securing the proper adjustment ot said spring with respect to said first adjusting means so that the air will escape at the pressure indicated on said scale, said first adjustable means comprising a tubular member. said other adjustable means comprising a tubular member threaded in said first tubular member, said tubular -memloersl 'affording` L passage for the es'eapescribed my neme in the presence of tyvowit# of the air, and an air operated signal` device nesses.

inserted into rvsaid firsttubular member and Y yFR EDHRICK A. SCHROEDR. secured 'theretol and supplied with air kVVit'nesses: Y i 5 through said tubular members. v HELLER,

In Witness whereof,l Ivht've hereunto suif Y Ni LEVERONE. 

